Again, you're wrong. And yes, you clearly have every intention of starting an argument. 1. If you'd simply read the link (which you clearly have not done), you

Again, you're wrong. And yes, you clearly have every intention of starting an argument. 1. If you'd simply read the link (which you clearly have not done), you'd understand that a k-value of 2.0 means that each customer referred an average of 2 new customers. I never said "probability". You did. Yes, probability above 1 is impossible, which is why I never used that word. You clearly conflated the two, which is your error, not mine. Here's why I said "likelyhood" (likelihood) instead of "probability": http://stats.stackexchange.com/a/2645 http://stats.stackexchange.com/a/2645 "...the likelihood function does not obey the laws of probability (for example, it's not bound to the [0, 1] interval). " 2. Reading-comprehension. It's not that hard.